Too Many Open Files

Fix the "too many open files" error killing a Node.js API under traffic.

A intermediate Linux challenge worth 10 points. Solve it hands-on in a real Linux environment in your browser - no local setup, no fake shells.

The Challenge

Your Node.js payment API rejects connections at peak load. dmesg shows "too many open files". The service runs as user nodeapp.

Your tasks:

• Check the running process fd limits: cat /proc/$(pgrep nodeapp)/limits
• Edit /etc/security/limits.conf — add soft and hard nofile 65536 for nodeapp
• Edit /etc/pam.d/common-session to ensure pam_limits.so is loaded
• Verify with cat /proc/$(pgrep nodeapp)/limits after session reload
• Run check to validate